Tractor · 1938Unverified
Allis Chalmers B
Allis Chalmers B — Row-Crop tractor · 20 hp. Reference specifications; pending source verification.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
20 hp
Max power
9.7 kW
Weight
934 kg
Hover a source tag to verify
Overview
ManufacturerAllis ChalmersReference
Row-Crop tractorReference
FactoriesWest Allis, Wisconsin, USAReference
FactoriesSouthampton, EnglandReference
Total built120,783Reference
Original price was $1,500 in 1957Reference
The Allis-Chalmers model B was the result of research by Harry Merritt, Allis tractor division manager, into U.S. farm sizes in the early 1930s. At that time, most tractors were being used on farms larger than 100 acres, while more than half of all farms were under 100 acres. The Allis B was specifically designed to enter into the small-farm market, and early literature focused on the economy of using tractors instead of horses.Reference
Two-wheel driveReference
SteeringmanualReference
Differential mechanical contracting band brakesReference
Open operator station. Canvas cab optional.Reference
Variants
IBindustrial tractorReference
Engine
Allis-Chalmers 2.1L 4-cyl gasolineReference
Allis-Chalmers 1.9L 4-cyl gasolineReference
Waukesha 1.9L 4-cyl gasolineReference
Fuel tank45.4 LReference
Plows1 (16-inch)Reference
Drawbar (tested)14.5 kWReference
Belt (tested)16.6 kWReference
Allis-Chalmers CEReference
gasolineReference
4-cylinderReference
liquid-cooledReference
Final engine, used from 1943 on, SN 64501Reference
Displacement2.1 LReference
Bore/Stroke86 x 89 mmReference
Air cleaneroil bathReference
Compression5.75:1Reference
Rated RPM1500Reference
Firing order1-2-4-3Reference
Starter volts6Reference
Oil capacity3.8 LReference
SparkplugAutolite AN 7Reference
SparkplugAC 45Reference
Sparkplug gap0.889 mmReference
Point gap0.508 mmReference
Intake valve clearance0.254 mmReference
Exhaust valve clearance0.254 mmReference
Allis-Chalmers BEReference
liquid-cooled vertical I-headReference
Second engine, used until 1943, SN 64500Reference
Displacement1.9 LReference
Bore/Stroke83 x 89 mmReference
Compression4.92:1Reference
Rated RPM1400Reference
Coolant capacity7.6 LReference
Sparkplug gap1.016 mmReference
WaukeshaReference
Original engine, used in 1937 on the first 96 tractors builtReference
Displacement1.9 LReference
Bore/Stroke76 x 102 mmReference
Belt power (max)11.7 kWReference
Max power9.7 kWReference
Belt power (max)16.6 kWReference
Max power14.5 kWReference
Transmission
3-speed unsynchronized gearReference
Typeunsynchronized gearReference
Gears3 forward and 1 reverseReference
Clutchdry discReference
Oil capacity5.7 LReference
Oil type[0oC]Reference
32oF [0oC]↑: SAE140Reference
32oF [0oC]↓: SAE90Reference
PTO & Hydraulics
TypeAllis Snap CouplerReference
Rear PTOtransmissionReference
Rear PTO Type560Reference
Dimensions
Wheelbase186 cmReference
Weight934 kgReference
Front tire4.00-15Reference
Rear tire9-24Reference
Ag front4.00-15Reference
Ag rear9-24Reference
Ag rear10-24Reference
Ag rear7-28 (Potato Special)Reference
Ag rear8-38 (Asparagus Special)Reference
Length280 cmReference
Width133 cmReference
Width157 cmReference
Height (exhaust)194 cmReference
Shipping weight934 kgReference
Ballasted weight1901 kgReference
Ground clearance55 cmReference
Ground clearance71 cmReference
Front tread106 cmReference
Front tread96 to 152 cmReference
Rear tread101 to 132 cmReference
Rear tread101 to 152 cmReference
B Serial Number Location
On top of transmission case, by shift lever. English-built models have an 'EB' serial number.Reference
B Serial Numbers
193897Reference
193911800Reference
194033502Reference
194149721Reference
194256782Reference
194364501Reference
194465502Reference
194570210Reference
194672265Reference
194773370Reference
194880556Reference
194992295Reference
1950102393Reference
1951114527Reference
1952118674Reference
1953122310Reference
1954124201Reference
1955124711Reference
1956126497Reference
1957127186Reference
Final127461Reference
19461001 (IB)Reference
19471003 (IB)Reference
19481010 (IB)Reference
19491282 (IB)Reference
19501556 (IB)Reference
19511879 (IB)Reference
19522219 (IB)Reference
19532570 (IB)Reference
19514001 (EB)Reference
19526861 (EB)Reference
19539200 (EB)Reference
195411120 (EB)Reference
FAQ: How to read a serial number table.Reference
Capacities
Diameter20 cmReference
Width13 cmReference
RPM1053Reference
Electrical
GroundpositiveReference
Charging systemgeneratorReference
Charging amps12Reference
Battery volts6Reference
Test results
NTTL 302: 116 ci gas 3-speed 2WDReference
NTTL 439: 125 ci gas 3-speed 2WDReference
116 ci gas 3-speed 2WDMay 31 - June 8, 1938Link: Nebraska Tractor Test 302 fileReference
Belt fuel use (max)5.7 l/hourReference
Drawbar performanceReference
Gear 2 used for power test.Reference
Max pull668 kgReference
Gear 2 used for pull test.Reference
125 ci gas 3-speed 2WDMay 17 - 24, 1950Link: Nebraska Tractor Test 439 fileReference
Belt fuel use (max)7.9 l/hourReference
Max pull1209 kgReference
Gear 1 used for pull test.Reference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.